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Q.

Which of the following ions is most paramagnetic

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a

Lu3+

b

Ce2+

c

Yb+2

d

Nd+2

answer is A.

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Detailed Solution

As the number of unpaired electrons increases ,paramagnetism is also increases.

70Yb+2 [Xe]4f14 6s0 ----No unpaired electrons (Diamagnetic)

60Nd+2 [Xe]4f4 6s0 ----4 unpaired electrons(paramagnetic)

 71Lu3+[Xe]4f14 5d06s0 ----No unpaired electrons (Diamagnetic)

58Ce2+ [Xe]4f1 5d06s0 ----1 unpaired electrons (paramagnetic)

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